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PJ hsjoi0214

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GoodDays!

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hsjoi0214 /README.md

PJ

Software Engineer β€’ Embedded Systems β€’ Data Engineering β€’ Agentic AI


About

I'm an Electrical Engineer with a background in embedded software and the e-mobility industry. As an Application Engineer, I developed device drivers, built battery testing and automation systems, and worked on software for embedded platforms.

Today, my work is centered around software, data, and AI. I'm building projects in Data Engineering, Agentic AI, and modern backend systems while creating technical content and courses that document what I learn along the way.

I enjoy designing reliable, scalable systems from data pipelines and cloud-native applications to LLM-powered workflows and autonomous AI agents. My goal is to build practical software that bridges traditional engineering with modern AI.


Current Focus

  • Agentic AI & AI Agents

  • Applied Machine Learning

  • Data Engineering

  • Backend Engineering

  • Cloud & Distributed Systems

  • MLOps & LLMOps

  • Open Source & Developer Tools


Broader Experience

  • Developed full-stack applications and Data science / ML-based projects, demonstrating proficiency across both software engineering and data infrastructure layers.

My experience in embedded systems taught me to build reliable, data-centric automation in distributed environments :β€” skills that map directly to modern data engineering and cloud computing.

Email Website Medium


Skills & Transition Path

  • focus
    Transitioning to working with production-grade data engineering, data science, and applied ML projects.

  • skills
    AWS Cloud Solutions: Glue, Lambda, API Gateway, S3, IaC (Terraform, CloudFormation), Simple Data Lake, CloudWatch, Cost Explorer, RDS, DynamoDB, IAM, VPC Security, Databricks, Jenkins (CI/CD), Airflow (DAGs).

  • technical
    AWS (Cloud): Lambda, S3, API Gateway, RDS, DynamoDB, IAM, Service Catalog, Terraform (IaC), CloudWatch, Cost Explorer, EKS, SQS, Glue, Athena, VPC, and others.

    Programming & Tools: Python, SQL, Unix Shell Scripting, PySpark, ETL.

    DevOps & Automation: CI/CD, Git, Jenkins, Airflow, Terraform (IaC), Kafka (Basic), Containerisation (EKS, Docker).

    Design & Architecture: System Design, Client-Server Architecture, Microservices, Serverless Architecture, Event-Driven Architecture, Data Modeling, Database Design.

    Observability & Monitoring: OpenTelemetry (Otel), Jaeger, Databricks, Prometheus, Grafana, custom DIY Monitoring & Observability Panel.


Featured Projects (learning + build)

Market Data Platform
Cloud-native streaming & batch pipelines for financial market data, data quality gates + real-time & analytical serving.

The Knowledge Drip
AI-driven knowledge delivery platform using hybrid search (BM25 + embeddings) & personalized insights via SMS.

RAGbot
RAG chatbot for Crime and Punishment β€” information retrieval + LLM via Streamlit.

Housing Price Prediction
Feature-engineered XGBoost pipeline; Streamlit app; Kaggle RMSE 0.12033.

Brazil Market Expansion
SQL + Tableau dashboards on an artificial Brazil market dataset; structured insights & schema design.

Eniac Discount Analysis
Discount strategy & product segmentation on 7ドル.8M revenue; seasonal demand & margin impact.

Weather App
Minimalist JS + OpenWeather app with essentials + outfit suggestions.

Movie Night
CLI scraper curating top 50 films of 2023; filters + GCS/Heroku.


Current Work & Learning

  • working

    1. Developing an Agentic AI solution as a freelance project for a startup, focusing on intelligent workflows, LLM orchestration, and production-ready AI system.
    2. Creating a project-based course on Agentic AI Systems and Data Engineering, covering practical architectures, tools, and real-world implementation.
  • learning

    1. Agentic Knowledge Graph construction and graph-based reasoning for AI systems.
    2. Advanced Agentic AI architectures, LLMOps, and production deployment patterns.

Journey & Achievements

Moving closer to downstream data roles through projects, certifications, and writing:


Collaboration & Contact

  • collaborate
    Open to collaborating on projects involving Agentic AI, Data Engineering, Backend Systems, and Applied Machine Learning.

  • askme
    AI agents, LLM applications, data pipelines, backend engineering, embedded software, and building production-ready software systems.

  • contact

  • funfact

Pinned Loading

  1. fact_scrap fact_scrap Public

    Read about this app at: https://medium.com/@prakash1402/the-knowledge-drip-b832e40206c0

    Python

  2. market-data-platform market-data-platform Public

    Cloud-native data engineering project that builds streaming and batch pipelines for financial market data, enforcing data quality gates and serving clean analytics to both real-time applications an...

    Python

  3. RAGbot RAGbot Public

    Retrieval-Augmented Generation (RAG) chatbot for exploring Crime and Punishment β€” combines document retrieval with LLMs to deliver context-aware, literary insights via a Streamlit app.

    Python

  4. housing-price-prediction housing-price-prediction Public

    End-to-end Kaggle house price predictor with domain-driven feature engineering, 2-stage feature filtering, and XGBoost β€” deployed as an interactive Streamlit app.

    Python

  5. brazil-market-expansion brazil-market-expansion Public

    Data storytelling project analyzing an artificial Brazil market dataset β€” SQL + Tableau dashboards with structured insights and schema design.

  6. eniac-discount-analysis eniac-discount-analysis Public

    Data analysis project exploring discount strategies and product segmentation on 7ドル.8M revenue dataset β€” uncovering insights on seasonal demand and margin impact.

    Python

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